Rotary drier.



L. F. GRISWOLD & O. B. SMITH.

ROTARY DRIER.

APPLICATION P'LLED 1,11;

Patented Dec. 9, 1913.

2 SHEETSSHEET 2.

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2 SHEETS-SHEET 1.

L. P. GRISWOLD & C. B. SMITH.

ROTARY DRIER APPLICATION FILED JAN 2. 1913.

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LQJIS FRED GRISWOLD AND CECZL BASS SMITH, 0F CLEVELAND, OHIO; SAIDGRIQTSW'GLU ASSIGNGEZ T0 SAID SMITH.

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Application filed January 2, 1913.

T0 QZZ .1)ii077bii may ooncewz Beit known that we, Louis lnso Giuswowand CECIL Bass SMITH, both citizens of the United States, and residentsof Cleveland, in the county of Cuyahoga and State of Ohio,have jointlyinvented anew and useful Improvementin Rotary Driers,of which thefollowing is a specification.

Our, invention relates to direct heat rotary driers, for drying sand,cement, tankage, etc and so far as our knowledge of the art extends,heretofore the I most satisfactory driers of the class have beenconstructed with the drying cylinder set on an incline, and providedinternally with lifting blades or other suitablemeans: for cascading oragitating the material. The cylinders are inclined for thepurpds'eofcausing the material to gradually trav el'from the feed end tothedischarge end of the cylinder. In order to obtain the desired result, ofthoroughly drying the material, it has been necessary to make thesecylinders fromtwenty to fifty feet in length, to retain the material inthe cylinder a sufficient length of time to dry. The cost of driers ofthis construction, and the large amount of space which they occupy,confines their sale almost wholly to large plants whose owners have moreor less extensive capital and makes them prohibitive to many would beusers, who have small capital and limited floor space. A

The objects of vide a direct heat drier at a comparative low cost, thatis simple and durable in construction, efficient in its operation, andcompact and self-contained, making it easy to install, and adapting itto the requirements of small plants, without in the least reducing theefliciency or materially reducing the per diem capacity in the drying ofmaterial of certain qualities.

Another object of the invention is to pro vide means for feeding thematerial from z'he hopper .to the drying cylinder, whereby the. saidmaterial subjected to beneficent effects of the heat, beforeit entersthe cylfinder.

A further object of the invention is the providing of meansfor-tempering the gases entering the cylinder, whereby the temper aturecan he kept under perfect control, which is very desirable fact-oi inthe drying of delicate materiaL Specification of Letters Patent.

this invention are to prov mder, causes the material contalned thereinPatented Doc. 9, 191 3. Serial No. 739,745.

Still another object of the invention is to provide means for closingthe gas inlet to the cylinder, and thereby causing the action of thesuction draft to produce a partial vacuum within the cylinder, whichexpedites the drying of the material.

Other objects and advantages of the invention will be made apparent fromthe following specification, considered in connection with theaccompanying drawings, in Wl11Cl1- i Figure 1 is a longitudinal,vertical section through the complete apparatus, excepting the dryingcylinder, which is shown with only a portion of the heads in section,and thesuction fan being shown in outline elevation. Fig. 2 is an endview, partially in section on line 2, 2 of Fig. 1, and Fig. 3 is afragmentary view illustrating a modified form of feeding means.

Throughout the drawings and specification, numerals are employed fordesignating toe different cooperating accessories.

An important feature of the invention is the eccentric, oblique rotationof the cylin der, and while we are aware that tl1is con struction is oldas applied to devices used for other purposes, it has not, to ourknowledge, heretofore been applied and employed to be thrown about fromend to end, and in.

all directions, thereby subjecting all parts of it to the heat impartedfrom the cylinder casing, and permitting the gases that enter thecylinder to commingle with, pass through the disintegrated mass as it isagitatcd by the tumbling process.

Referring now to the drawings, 1 represents a housing which issuperimposed relative to the furnace 2. The housing forms a chamber 3which is in open communication with the furnace 2, through the openings2 in the furnace arch.

The drying cylinder 4 is closed at both ends by the heads 4? and 4".trunnion 5 is rigidly attached to the cylinder head 4 eccentric to thecenter line thereof, and a trunnion G is rigidly attached to the head4", eccentric ,to. the center line thereof, and obliquely to thetrunnion 5. The trunnions 'erating in the hollow trunnion 5 and 6 aremounted in suitable bearings 7 aim giroc Fig. i s" n r vto the interioror tr pening 4 in the eylznder ii A registering with the opening in ietrunnion 5. A. suction fan 10, or other suitaole suction draft means isarranged in open. connection with the passage The cylinder lead i" isprovided with an opening I, the trunnion 5 is provided with a(fllilllllw. 6 with which the opening & coniniunicat pass throng (i intothe chamber A valve 11 is provided "for pening and closing the opening dIt will be readily understood, that, when the valve 11 is open, theheated gases from the chamber 3 will be drawn by the suction fan 10through the openings 6" and i, into the interior of the drying cylinder,and out through the passage 5. \Vhen the valve 11 is closed, the actionof-the. suction fan will produce a partial vacuum in .thetlryingcylinder, the advantage of which will hereinafter be'mentione-d.

A novel method of feeding the material into the drying cylinderis'provided by a spiral conveyer 12, connected with, and op- 5; thisconveyer extends into a depending portion 13 of the hopper 13. Thematerial from the thrbugh the s into the cylinder 4:, and is eirpos tothe heated gases being drawn by the suction tan, through the saidpassage. in the opposite direction; The material after being dried isdischarged through an opening in the cylinder head t", which is providedwith a suitable closure member, adapted to be removed, and soconstructed that it can be replaced and tightly locked during therotation of the cylinder.

@116 or more openings 1% are provided in the housing 1, through whichexternal air can be admitted to the chamber and by commingling'with theheated gases, reduce the temperature. he supply of air through theopenings it is regulated and controlled by suitable dampers.

\Vhile the p material to the d the hollow trunnion shown in Fig. t'ni:housing 1, and dome suitable sealin In the opera red manner of feedingthe ting cylinder, is through the feed may be otherwise made fast tothe5 "es from the chamber a hatch 15, in the provided with a .the nriterialis te l into the cylinder, which. imparts heati operation of theapparatus,

drying cylinder, to the extent of approximately one-third of thecapacity of said cylinder. As the cylinder is rotated the material isagitated by be ing tumbled about in all directions. The gases from thefurnace heat the shell of the to the material In the first sta es of theif the wave 11. is

contained therein.

closed the drying etl'ect of cylinder shell is enhanced by the partialvacuum produced by the suction fan 10. After the material has been driedto a certain extent, which depends on the nature of the material, thevalve 11 is opened and the heated gases pass through the'cylinder andcomplete the drying process. If the temperature is found to be too high,it may be regulated by the dampers in the openings 14..

While we have, in this specification, de-

scribed and shown an apparatus embodying the principles of ourinvention, we do not intend to be limited to this particular conihe heatfrom the struction, only in so far as required by the scope of theclaims, and the'existing state of the art to which the apparatusappcrtains.

hat we claim and clesire to secure by Letters Patent is- 1. In a rotarydrier, a drying cylinder adapted to rotate eccentrically and obliquelyto the rotation of the driving member, whereby the material to be driedis agitated, in combination with means for drawing a heating and dryingmedium through the interior of said cylinder.

2.111 a rotary drier, 'a drying cylinder adapted to rotate eccentricallyand obliquely to the rotation of the driving member whereby the materialto be dried is agitated,

in combination with an opening or openings for admitting heat to theinterior of said cylinder, suction means for drawing the heat throughthe interior of the cylinder, and means for closing the admissionopenings whereby the suction means will cause a partial vacuum in saidcylinder.

3. In a rotary drier, a drying cylinder adapted to rotate eccentricallyand obliquely to the rotation of the driving member whereby the materialto be dried is agitated tion with an inclosing chamber in E -r rotatesmeans for sup- 7 chamber, means for e cl'iai'nl;-er through the cans forad- "ily of non ier wherein combit ea ed, exterior air to the end n t bythe temperature of the medium within said chamber and the cylinder isreduced.

t. In a rotary drier, the combination of a drying cylinder, an inclosingchamber in which said cylinder is adapted torotate, trunnionseccentric-shy and obliquely at the two heads of said cylinder mil itablebeariags, a longitudinal opening in one of the trunnions and its at-,tached cylinder head, suction draft means connected with the interiorof the cylinder through the said opening, open communication from thechamber to the interior of the cylinder through the opposite trunnionand cylinder head, whereby heat from the chamber isdrawn through thecylinder, means for feeding material to be dried to said cylinder, andmeans for discharging the dried material therefrom.

5. In a rotary drier, the combination of a drying cylinder, an inclosingchamber in which said cylinder is adapted to rotate, means for supplyingheat to said chamber, a hollow trunnion eccentrically attached to onehead of said cylinder, open communication from a suction draft means,through the hollow trunnion to the interior of the cylinder, means forfeeding material to the interior of the cylinder through the said hollowtrunnion, a trunnion attached eccentrically to the opposite head of thecylinder and in oblique relation to the first named trunnion, opencommunication from the chamber to the interior of the cylinder throughthe last named cylinder head, and means for closing said opening.

6. In a rotary drier the combination of a drying cylinder; an inclosingchamber in which said cylinder is adapted to rotate;

means for supplying heat to said chamber; t-runnions attached to theopposite heads of the drying cylinder and mounted in suitable bearings,whereby said cylinder is revolved; a longitudinal opening in one of thetrunnions and its attached cylinder head at the feed end; aspiralconveyer attached to the trunnion within said opening, whereby thematerial is fed to the interior of the cylinder by the revolution of thetrunnion; means for admitting heat from the chamber to the interior ofthe cylinder; and suctiondraft means connected with the cylinder at thfeed end thereof. LOUIS FRED GRISWOLD.

CECIL BASS SMITIL Witnesses W. A. CAREY,

W. G. MOORE.

